The Tang Dynasty (6 18 ~907) is recognized as one of the most powerful times in China. Li Yuan established the Tang Dynasty in 6 18, with Chang 'an as its capital (now Xi City, Shaanxi Province) and Luoyang as its east capital. In its heyday, the desert of Central Asia was also ruled by it in the 7th century. In 690, Wu Zetian changed the country name "Tang" to "Zhou" and moved the capital to Luoyang, known as the capital of the gods, known as Wu Zhou in history, also known as "Southern Zhou". It was not until 705 that Tang Zhongzong Li Xian regained the title of Datang. After the Anshi Rebellion in the 14th year of Tianbao (755), the Tang Dynasty gradually declined. God bless four years (907), Zhu Wen, King of Liang, usurped the throne and perished. * * * lasted for 289 years and spread 2 1 emperor (plus Wu Zetian was 22 emperors). The Tang Dynasty made brilliant achievements in culture, politics, economy and diplomacy, and was one of the most powerful countries in the world at that time. Culturally, the political system and culture of East Asian neighbors at that time, including Silla, Bohai and Japan, were also deeply influenced by it. Militarily, after the Northern Wei Dynasty defeated Rouran, the Tang Dynasty once again achieved a major military victory over the desert tribes by the Central Plains Dynasty. Economically, there was a "golden age" in the Xuanzong period of the Tang Dynasty, and the economy of the Tang Dynasty has far surpassed that of Byzantium and Arabia in the same period. The title of "Tang" is the ancient name of Jin, which generally refers to the central area of Shanxi Province today. Legend has it that the monarch of Yao is called "Tang Tao". During the Zhou Dynasty, there was a small country called Tang State in today's Hubei Province. Li Hu, the grandfather of Tang Gaozu Li Yuan, was one of the Eight Pillars countries in the Northern Zhou Dynasty. He was named "Duke Tang" and the title was passed on to Li Yuan. After the Sui Dynasty, Li Yuan lived in Taiyuan and stayed. Li Yuan called himself the "King of the Tang Dynasty" after he started his army, and later abolished Emperor Yangdi Yang Gang to establish the "Tang Dynasty". After the demise of the Tang Dynasty, the later Tang Dynasty in Li Jianli in the Five Dynasties and the southern Tang Dynasty in the Ten Kingdoms both claimed to be the successors of the Tang Dynasty, and both took "Tang" as their country name. In fact, their emperor had nothing to do with the Tang Dynasty. Li, a royal family in the Tang Dynasty, claimed to be from Zhao County of Han nationality, and the Li family was also a military aristocrat in Longxi. Li in Longxi was a famous family of military commanders in China during the Qin Dynasty. Li Guang, the flying general of the Western Han Dynasty, and other famous soldiers emerged in this family. However, some people doubt this statement and think that Li, the royal family of the Tang Dynasty, is a descendant of Xianbei. In Old Tang Book and New Tang Book, it is said that Li, the royal family of the Tang Dynasty, is a descendant of Lao Er, and Li Gui, the founding monarch of the Sixteen Countries, is also his distant ancestor. During the Northern Zhou Dynasty, Li followed the standard policy of Guanlong Group and changed his name to "Xiao Ye", which is a newly created surname. After the demise of the Northern Zhou Dynasty, it was restored as Lee. The Tang Dynasty and Sui Dynasty are regarded by historian Huang Renyu as the second imperial period of China after Qin and Han Dynasties, while Japanese historians generally believe that the Tang Dynasty was the end of China's "Middle Ages". The national strength of the Tang Dynasty was one of the best in China's history, so China people were also called "Tangren", and today China people in the west are also called "Chinatown".